Eco-Warriors v Escapologists (rematch)
Victoria Coren Mitchell asks the questions as round three losers the Eco-Warriors and the Escapologists return for one last chance to win a place in the semi-finals. They must use patience, lateral thinking and sheer inspiration to make connections between groups of four things that may appear at first not to be linked, with one set of clues consisting of Oh! Calcutta!, Mayday, Love in tennis, and Dandelion.